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Grand Duke Henri and Grand Duchess Maria-Teresa of Luxembourg arrive for a gala dinner at the Operahouse in Oslo on May 10, 2017 in celebration of the 80th bithdays of King Harald of Norway and Queen Sonja of Norway. / AFP PHOTO / NTB scanpix AND NTB Scanpix / Nesvold, Jon Olav / Norway OUT (Photo credit should read NESVOLD, JON OLAV/AFP/Getty Images)

Grand Duke Henri and Grand Duchess Maria-Teresa of Luxembourg arrive for a gala dinner at the Operahouse in Oslo on May 10, 2017 in celebration of the 80th bithdays of King Harald of Norway and Queen Sonja of Norway. / AFP PHOTO / NTB scanpix AND NTB Scanpix / Nesvold, Jon Olav / Norway OUT        (Photo credit should read NESVOLD, JON OLAV/AFP/Getty Images)